JEE Main 2021 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 25 July 2021, Shift 1, Chemistry Q59

Question 59 of 90 in this shift, Chemistry question 29 of 30, Section B.

Consider the complete combustion of butane, the amount of butane utilized to produce 72.0 g of water is ________

\times10^{-1}

g. (in nearest integer)

Official answer

464

NTA final key.

Chapter: Some Basic Concepts of Chemistry
Topic: Stoichiometry
Idea tested: Hydrocarbon Combustion General Equation

Same idea in other shifts

Asked 3× in all

2 Apr 2026, Shift 2 · Q51The ratio of mass percentage (w/w) of C : H in a hydrocarbon is 12 : 1. It has two carbon atoms. The weight (in g) of $CO_2(g)$ formed…MediumSingle correct
24 Jun 2022, Shift 1 · Q61If a rocket runs on a fuel ( $\mathrm{C_{15}H_{30}}$ ) and liquid oxygen, the weight of oxygen required and $\mathrm{CO_2}$ released for…MediumSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.